In late May, the Banja Luka District Court cancelled the environmental permit for the planned 93 MW Buk Bijela hydropower plant on the river Drina in Bosnia-Herzegovina on the basis of a complaint submitted by the Aarhus Centar in 2018. The Drina is also the most important habitat of the endangered Danube Salmon, found only in some of the cleanest rivers in the Danube basin of southeast Europe.